Sounds like a hot stamper! Jackpot Records, Willie Nelson, "....and then I wrote"

Yes, there are a few titles that I buy over and over again, just searching for the best possible sample of that particular recording. But I've never bought more than, say, half a dozen different copies of any.

Does anyone know how Hot Stampers acquire and screen their hot stampings?? For example, do they look for low numbers on the inner groove of the LP, showing that the LP in question was one of the first several that came off the master? I’ve always wondered why my LPs that have a label on the jacket saying that they were "for demonstration purposes only" (or words to that effect) are among the best sounding of the LPs I own. Is it the case that demonstration albums were distributed to record stores early on after the release date in order to promote that particular LP?  That would make examples with the "for demonstration only" label highly desirable.